StringInfo StringInfo StringInfo StringInfo Class

Definice

Poskytuje funkce pro rozdělení řetězce na textové prvky a iterování skrze tyto textové prvky.Provides functionality to split a string into text elements and to iterate through those text elements.

public ref class StringInfo
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public class StringInfo
type StringInfo = class
Public Class StringInfo
Dědičnost
StringInfoStringInfoStringInfoStringInfo
Atributy

Příklady

V tomto příkladu se GetTextElementEnumerator používá ParseCombiningCharacters metody StringInfo a třídy pro manipulaci s řetězcem, který obsahuje náhradní a kombinované znaky.This example uses the GetTextElementEnumerator and ParseCombiningCharacters methods of the StringInfo class to manipulate a string that contains surrogate and combining characters.

using namespace System;
using namespace System::Text;
using namespace System::Globalization;


// Show how to enumerate each real character (honoring surrogates)
// in a string.

void EnumTextElements(String^ combiningChars)
{
    // This StringBuilder holds the output results.
    StringBuilder^ sb = gcnew StringBuilder();

    // Use the enumerator returned from GetTextElementEnumerator
    // method to examine each real character.
    TextElementEnumerator^ charEnum =
        StringInfo::GetTextElementEnumerator(combiningChars);
    while (charEnum->MoveNext())
    {
        sb->AppendFormat("Character at index {0} is '{1}'{2}", 
            charEnum->ElementIndex, charEnum->GetTextElement(), 
            Environment::NewLine);
    }

    // Show the results.
    Console::WriteLine("Result of GetTextElementEnumerator:");
    Console::WriteLine(sb);
}


// Show how to discover the index of each real character
// (honoring surrogates) in a string.

void EnumTextElementIndexes(String^ combiningChars)
{
    // This StringBuilder holds the output results.
    StringBuilder^ sb = gcnew StringBuilder();

    // Use the ParseCombiningCharacters method to
    // get the index of each real character in the string.
    array <int>^ textElemIndex =
        StringInfo::ParseCombiningCharacters(combiningChars);

    // Iterate through each real character showing the character
    // and the index where it was found.
    for (int i = 0; i < textElemIndex->Length; i++)
    {
        sb->AppendFormat("Character {0} starts at index {1}{2}",
            i, textElemIndex[i], Environment::NewLine);
    }

    // Show the results.
    Console::WriteLine("Result of ParseCombiningCharacters:");
    Console::WriteLine(sb);
}

int main()
{

    // The string below contains combining characters.
    String^ combiningChars = L"a\u0304\u0308bc\u0327";

    // Show each 'character' in the string.
    EnumTextElements(combiningChars);

    // Show the index in the string where each 'character' starts.
    EnumTextElementIndexes(combiningChars);

};

// This code produces the following output.
//
// Result of GetTextElementEnumerator:
// Character at index 0 is 'a-"'
// Character at index 3 is 'b'
// Character at index 4 is 'c,'
//
// Result of ParseCombiningCharacters:
// Character 0 starts at index 0
// Character 1 starts at index 3
// Character 2 starts at index 4
using System;
using System.Text;
using System.Globalization;

public sealed class App {
   static void Main() {
      // The string below contains combining characters.
      String s = "a\u0304\u0308bc\u0327";

      // Show each 'character' in the string.
      EnumTextElements(s);

      // Show the index in the string where each 'character' starts.
      EnumTextElementIndexes(s);
   }

   // Show how to enumerate each real character (honoring surrogates) in a string.
   static void EnumTextElements(String s) {
      // This StringBuilder holds the output results.
      StringBuilder sb = new StringBuilder();

      // Use the enumerator returned from GetTextElementEnumerator 
      // method to examine each real character.
      TextElementEnumerator charEnum = StringInfo.GetTextElementEnumerator(s);
      while (charEnum.MoveNext()) {
         sb.AppendFormat(
           "Character at index {0} is '{1}'{2}",
           charEnum.ElementIndex, charEnum.GetTextElement(),
           Environment.NewLine);
      }

      // Show the results.
      Console.WriteLine("Result of GetTextElementEnumerator:");
      Console.WriteLine(sb);
   }

   // Show how to discover the index of each real character (honoring surrogates) in a string.
   static void EnumTextElementIndexes(String s) {
      // This StringBuilder holds the output results.
      StringBuilder sb = new StringBuilder();

      // Use the ParseCombiningCharacters method to 
      // get the index of each real character in the string.
      Int32[] textElemIndex = StringInfo.ParseCombiningCharacters(s);

      // Iterate through each real character showing the character and the index where it was found.
      for (Int32 i = 0; i < textElemIndex.Length; i++) {
         sb.AppendFormat(
            "Character {0} starts at index {1}{2}",
            i, textElemIndex[i], Environment.NewLine);
      }

      // Show the results.
      Console.WriteLine("Result of ParseCombiningCharacters:");
      Console.WriteLine(sb);
   }
}

// This code produces the following output.
//
// Result of GetTextElementEnumerator:
// Character at index 0 is 'a-"'
// Character at index 3 is 'b'
// Character at index 4 is 'c,'
// 
// Result of ParseCombiningCharacters:
// Character 0 starts at index 0
// Character 1 starts at index 3
// Character 2 starts at index 4
Imports System.Text
Imports System.Globalization

Public Module Example
   Public Sub Main()
      ' The string below contains combining characters.
      Dim s As String = "a" + ChrW(&h0304) + ChrW(&h0308) + "bc" + ChrW(&h0327)

      ' Show each 'character' in the string.
      EnumTextElements(s)

      ' Show the index in the string where each 'character' starts.
      EnumTextElementIndexes(s)
   End Sub

   ' Show how to enumerate each real character (honoring surrogates) in a string.
   Sub EnumTextElements(s As String)
      ' This StringBuilder holds the output results.
      Dim sb As New StringBuilder()

      ' Use the enumerator returned from GetTextElementEnumerator 
      ' method to examine each real character.
      Dim charEnum As TextElementEnumerator = StringInfo.GetTextElementEnumerator(s)
      Do While charEnum.MoveNext()
         sb.AppendFormat("Character at index {0} is '{1}'{2}",
                         charEnum.ElementIndex, 
                         charEnum.GetTextElement(),
                         Environment.NewLine)
      Loop

      ' Show the results.
      Console.WriteLine("Result of GetTextElementEnumerator:")
      Console.WriteLine(sb)
   End Sub

   ' Show how to discover the index of each real character (honoring surrogates) in a string.
   Sub EnumTextElementIndexes(s As String)
      ' This StringBuilder holds the output results.
      Dim sb As New StringBuilder()

      ' Use the ParseCombiningCharacters method to 
      ' get the index of each real character in the string.
      Dim textElemIndex() As Integer = StringInfo.ParseCombiningCharacters(s)

      ' Iterate through each real character showing the character and the index where it was found.
      For i As Int32 = 0 To textElemIndex.Length - 1
         sb.AppendFormat("Character {0} starts at index {1}{2}",
                         i, textElemIndex(i), Environment.NewLine)
      Next

      ' Show the results.
      Console.WriteLine("Result of ParseCombiningCharacters:")
      Console.WriteLine(sb)
   End Sub
End Module
' The example displays the following output:
'       Result of GetTextElementEnumerator:
'       Character at index 0 is 'a-"'
'       Character at index 3 is 'b'
'       Character at index 4 is 'c,'
'       
'       Result of ParseCombiningCharacters:
'       Character 0 starts at index 0
'       Character 1 starts at index 3
'       Character 2 starts at index 4

Poznámky

Rozhraní .NET definuje textový prvek jako jednotku textu, která se zobrazuje jako jeden znak, tj. grapheme..NET defines a text element as a unit of text that is displayed as a single character, that is, a grapheme. Textový prvek může být základní znak, náhradní pár nebo posloupnost znaků s diakritikou.A text element can be a base character, a surrogate pair, or a combining character sequence. Standard Unicode definuje náhradní pár jako reprezentaci kódovaného znaku pro jeden abstraktní znak, který se skládá z sekvence dvou kódových jednotek, kde první jednotka dvojice je vysoká náhrada a druhá je nízká náhrada.The Unicode Standard defines a surrogate pair as a coded character representation for a single abstract character that consists of a sequence of two code units, where the first unit of the pair is a high surrogate and the second is a low surrogate. Standard Unicode definuje posloupnost znaků kombinování jako kombinaci základního znaku a jednoho nebo více kombinací znaků.The Unicode Standard defines a combining character sequence as a combination of a base character and one or more combining characters. Náhradní pár může představovat základní znak nebo znak diakritického znaménka.A surrogate pair can represent a base character or a combining character.

Třída umožňuje pracovat s řetězcem jako řadou textových prvků namísto individuálních Char objektů. StringInfoThe StringInfo class enables you to work with a string as a series of textual elements rather than individual Char objects.

Chcete-li vytvořit StringInfo instanci objektu, který představuje zadaný řetězec, můžete provést jednu z následujících akcí:To instantiate a StringInfo object that represents a specified string, you can do either of the following:

Můžete pracovat s jednotlivými textovými prvky v řetězci dvěma způsoby:You can work with the individual text elements in a string in two ways:

Následující příklad znázorňuje oba způsoby práce s textovými prvky v řetězci.The following example illustrates both ways of working with the text elements in a string. Vytvoří dva řetězce:It creates two strings:

  • strCombining, což je řetězec arabských znaků, který obsahuje tři textové prvky s více Char objekty.strCombining, which is a string of Arabic characters that includes three text elements with multiple Char objects. První prvek textu je základní znak Arabské písmeno ALEF (U +-627) následovaný ARABSKOu HAMZOU níže (U +-655) a ARABSKOu KASRA (U + 0650).The first text element is the base character ARABIC LETTER ALEF (U+-627) followed by ARABIC HAMZA BELOW (U+-655) and ARABIC KASRA (U+0650). Druhý textový prvek je Arabské písmeno Há (U + 0647) následované ARABSKOu FATHA (U +-64E).The second text element is ARABIC LETTER HEH (U+0647) followed by ARABIC FATHA (U+-64E). Třetím prvkem textu je arabské LETTTER Bá (U + 0628), za kterým následuje arabské DAMMATAN (U + 064C).The third text element is ARABIC LETTTER BEH (U+0628) followed by ARABIC DAMMATAN (U+064C).

  • strSurrogates, což je řetězec, který obsahuje tři náhradní páry: ŘECKá ACROPHONIC pět zkušeností (U + 10148) z doplňkové vícejazyčné roviny U + 20026 z doplňkové grafické roviny a U + F1001 z oblasti private User.strSurrogates, which is a string that includes three surrogate pairs: GREEK ACROPHONIC FIVE TALENTS (U+10148) from the Supplementary Multilingual Plane, U+20026 from the Supplementary Ideographic Plane, and U+F1001 from the private user area. Kódování UTF-16 každého znaku je náhradní pár, který se skládá z vysoké náhrady následovaný malým náhradou.The UTF-16 encoding of each character is a surrogate pair that consists of a high surrogate followed by a low surrogate.

Každý řetězec je analyzován jednou ParseCombiningCharacters metodou a potom GetTextElementEnumerator metodou.Each string is parsed once by the ParseCombiningCharacters method and then by the GetTextElementEnumerator method. Obě metody správně analyzují textové prvky ve dvou řetězcích a zobrazují výsledky operace analýzy.Both methods correctly parse the text elements in the two strings and display the results of the parsing operation.

using System;
using System.Globalization;

public class Example
{
   public static void Main()
   {
      // The Unicode code points specify Arabic base characters and 
      // combining character sequences.
      string strCombining = "\u0627\u0655\u0650\u064A\u0647\u064E" +
                            "\u0627\u0628\u064C";

      // The Unicode code points specify private surrogate pairs.
      string strSurrogates = Char.ConvertFromUtf32(0x10148) +
                             Char.ConvertFromUtf32(0x20026) + "a" +
                             Char.ConvertFromUtf32(0xF1001);
      
      EnumerateTextElements(strCombining);
      EnumerateTextElements(strSurrogates);
   }

   public static void EnumerateTextElements(string str)
   {
      // Get the Enumerator.
      TextElementEnumerator teEnum = null;      

      // Parse the string using the ParseCombiningCharacters method.
      Console.WriteLine("\nParsing with ParseCombiningCharacters:");
      int[] teIndices = StringInfo.ParseCombiningCharacters(str);
      
      for (int i = 0; i < teIndices.Length; i++) {
         if (i < teIndices.Length - 1)
            Console.WriteLine("Text Element {0} ({1}..{2})= {3}", i, 
               teIndices[i], teIndices[i + 1] - 1, 
               ShowHexValues(str.Substring(teIndices[i], teIndices[i + 1] - 
                             teIndices[i])));
         else
            Console.WriteLine("Text Element {0} ({1}..{2})= {3}", i, 
               teIndices[i], str.Length - 1, 
               ShowHexValues(str.Substring(teIndices[i])));
      }
      Console.WriteLine();

      // Parse the string with the GetTextElementEnumerator method.
      Console.WriteLine("Parsing with TextElementEnumerator:");
      teEnum = StringInfo.GetTextElementEnumerator(str);

      int teCount = - 1;

      while (teEnum.MoveNext()) {
         // Displays the current element.
         // Both GetTextElement() and Current retrieve the current
         // text element. The latter returns it as an Object.
         teCount++;
         Console.WriteLine("Text Element {0} ({1}..{2})= {3}", teCount, 
            teEnum.ElementIndex, teEnum.ElementIndex + 
            teEnum.GetTextElement().Length - 1, ShowHexValues((string)(teEnum.Current)));
      }
   }
   
   private static string ShowHexValues(string s)
   {
      string hexString = "";
      foreach (var ch in s)
         hexString += String.Format("{0:X4} ", Convert.ToUInt16(ch));

      return hexString;
   }
}
// The example displays the following output:
//       Parsing with ParseCombiningCharacters:
//       Text Element 0 (0..2)= 0627 0655 0650
//       Text Element 1 (3..3)= 064A
//       Text Element 2 (4..5)= 0647 064E
//       Text Element 3 (6..6)= 0627
//       Text Element 4 (7..8)= 0628 064C
//       
//       Parsing with TextElementEnumerator:
//       Text Element 0 (0..2)= 0627 0655 0650
//       Text Element 1 (3..3)= 064A
//       Text Element 2 (4..5)= 0647 064E
//       Text Element 3 (6..6)= 0627
//       Text Element 4 (7..8)= 0628 064C
//       
//       Parsing with ParseCombiningCharacters:
//       Text Element 0 (0..1)= D800 DD48
//       Text Element 1 (2..3)= D840 DC26
//       Text Element 2 (4..4)= 0061
//       Text Element 3 (5..6)= DB84 DC01
//       
//       Parsing with TextElementEnumerator:
//       Text Element 0 (0..1)= D800 DD48
//       Text Element 1 (2..3)= D840 DC26
//       Text Element 2 (4..4)= 0061
//       Text Element 3 (5..6)= DB84 DC01
Imports System.Globalization

Public Module Example
   Public Sub Main()
      ' The Unicode code points specify Arabic base characters and 
      ' combining character sequences.
      Dim strCombining As String = ChrW(&H627) & ChrW(&h0655) + ChrW(&H650) & 
              ChrW(&H64A) & ChrW(&H647) & ChrW(&H64E) & ChrW(&H627) & 
              ChrW(&H628) & ChrW(&H64C)

      ' The Unicode code points specify private surrogate pairs.
      Dim strSurrogates As String = Char.ConvertFromUtf32(&h10148) +
                                    Char.ConvertFromUtf32(&h20026) + "a" +
                                    Char.ConvertFromUtf32(&hF1001)
      
      EnumerateTextElements(strCombining)
      EnumerateTextElements(strSurrogates)
   End Sub

   Public Sub EnumerateTextElements(str As String)
      ' Get the Enumerator.
      Dim teEnum As TextElementEnumerator = Nothing      

      ' Parse the string using the ParseCombiningCharacters method.
      Console.WriteLine()
      Console.WriteLine("Parsing with ParseCombiningCharacters:")
      Dim teIndices As Integer() = StringInfo.ParseCombiningCharacters(str)
      
      For i As Integer = 0 To teIndices.Length - 1
         If i < teIndices.Length - 1 Then
            Console.WriteLine("Text Element {0} ({1}..{2})= {3}", i, 
               TEIndices(i), TEIndices((i + 1)) - 1, 
               ShowHexValues(str.Substring(TEIndices(i), TEIndices((i + 1)) - 
                             teIndices(i))))
         Else
            Console.WriteLine("Text Element {0} ({1}..{2})= {3}", i, 
               teIndices(i), str.Length - 1, 
               ShowHexValues(str.Substring(teIndices(i))))
         End If
      Next
      Console.WriteLine()

      ' Parse the string with the GetTextElementEnumerator method.
      Console.WriteLine("Parsing with TextElementEnumerator:")
      teEnum = StringInfo.GetTextElementEnumerator(str)

      Dim TECount As Integer = - 1

      While teEnum.MoveNext()
         ' Prints the current element.
         ' Both GetTextElement() and Current retrieve the current
         ' text element. The latter returns it as an Object.
         TECount += 1
         Console.WriteLine("Text Element {0} ({1}..{2})= {3}", teCount, 
            teEnum.ElementIndex, teEnum.ElementIndex + 
            teEnum.GetTextElement().Length - 1, ShowHexValues(CStr(teEnum.Current)))
      End While
   End Sub
   
   Private Function ShowHexValues(s As String) As String
      Dim hexString As String = ""
      For Each ch In s
         hexString += String.Format("{0:X4} ", Convert.ToUInt16(ch))
      Next
      Return hexString
   End Function
End Module
' The example displays the following output:
'       Parsing with ParseCombiningCharacters:
'       Text Element 0 (0..2)= 0627 0655 0650
'       Text Element 1 (3..3)= 064A
'       Text Element 2 (4..5)= 0647 064E
'       Text Element 3 (6..6)= 0627
'       Text Element 4 (7..8)= 0628 064C
'       
'       Parsing with TextElementEnumerator:
'       Text Element 0 (0..2)= 0627 0655 0650
'       Text Element 1 (3..3)= 064A
'       Text Element 2 (4..5)= 0647 064E
'       Text Element 3 (6..6)= 0627
'       Text Element 4 (7..8)= 0628 064C
'       
'       Parsing with ParseCombiningCharacters:
'       Text Element 0 (0..1)= D800 DD48
'       Text Element 1 (2..3)= D840 DC26
'       Text Element 2 (4..4)= 0061
'       Text Element 3 (5..6)= DB84 DC01
'       
'       Parsing with TextElementEnumerator:
'       Text Element 0 (0..1)= D800 DD48
'       Text Element 1 (2..3)= D840 DC26
'       Text Element 2 (4..4)= 0061
'       Text Element 3 (5..6)= DB84 DC01

Poznámky pro volající

Interně metody StringInfo třídy volají metody CharUnicodeInfo třídy k určení kategorií znaků.Internally, the methods of the StringInfo class call the methods of the CharUnicodeInfo class to determine character categories. Počínaje .NET Framework 4.6.2 je klasifikace znaků založená na standardu Unicode verze 8.0.0.Starting with the .NET Framework 4.6.2, character classification is based on The Unicode Standard, Version 8.0.0. Pro .NET Framework 4 až .NET Framework 4.6.1 je založená na standardu Unicode verze 6.3.0.For the .NET Framework 4 through the .NET Framework 4.6.1, it is based on The Unicode Standard, Version 6.3.0. V .NET Core je založena na standardu Unicode verze 8.0.0.In .NET Core, it is based on The Unicode Standard, Version 8.0.0.

Konstruktory

StringInfo() StringInfo() StringInfo() StringInfo()

Inicializuje novou instanci třídy StringInfo třídy.Initializes a new instance of the StringInfo class.

StringInfo(String) StringInfo(String) StringInfo(String) StringInfo(String)

Inicializuje novou instanci StringInfo třídy se zadaným řetězcem.Initializes a new instance of the StringInfo class to a specified string.

Vlastnosti

LengthInTextElements LengthInTextElements LengthInTextElements LengthInTextElements

Získá počet textových prvků v aktuálním StringInfo objektu.Gets the number of text elements in the current StringInfo object.

String String String String

Získá nebo nastaví hodnotu aktuálního StringInfo objektu.Gets or sets the value of the current StringInfo object.

Metody

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

Označuje, zda je StringInfo aktuální objekt roven zadanému objektu.Indicates whether the current StringInfo object is equal to a specified object.

GetHashCode() GetHashCode() GetHashCode() GetHashCode()

Vypočítá kód hodnoty hash pro hodnotu aktuálního StringInfo objektu.Calculates a hash code for the value of the current StringInfo object.

GetNextTextElement(String) GetNextTextElement(String) GetNextTextElement(String) GetNextTextElement(String)

Získá první prvek textu v zadaném řetězci.Gets the first text element in a specified string.

GetNextTextElement(String, Int32) GetNextTextElement(String, Int32) GetNextTextElement(String, Int32) GetNextTextElement(String, Int32)

Získá textový prvek v zadaném indexu zadaného řetězce.Gets the text element at the specified index of the specified string.

GetTextElementEnumerator(String) GetTextElementEnumerator(String) GetTextElementEnumerator(String) GetTextElementEnumerator(String)

Vrátí enumerátor, který projde textovými prvky celého řetězce.Returns an enumerator that iterates through the text elements of the entire string.

GetTextElementEnumerator(String, Int32) GetTextElementEnumerator(String, Int32) GetTextElementEnumerator(String, Int32) GetTextElementEnumerator(String, Int32)

Vrátí enumerátor, který projde textovými prvky řetězce počínaje zadaným indexem.Returns an enumerator that iterates through the text elements of the string, starting at the specified index.

GetType() GetType() GetType() GetType()

Type Získá aktuální instanci.Gets the Type of the current instance.

(Inherited from Object)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

Vytvoří kopii aktuálního Objectseznamu.Creates a shallow copy of the current Object.

(Inherited from Object)
ParseCombiningCharacters(String) ParseCombiningCharacters(String) ParseCombiningCharacters(String) ParseCombiningCharacters(String)

Vrátí indexy každého základního znaku, vysoké náhrady nebo řídicího znaku v rámci zadaného řetězce.Returns the indexes of each base character, high surrogate, or control character within the specified string.

SubstringByTextElements(Int32) SubstringByTextElements(Int32) SubstringByTextElements(Int32) SubstringByTextElements(Int32)

Načte podřetězec textových prvků z aktuálního StringInfo objektu počínaje zadaným textovým prvkem a pokračuje skrze poslední textový prvek.Retrieves a substring of text elements from the current StringInfo object starting from a specified text element and continuing through the last text element.

SubstringByTextElements(Int32, Int32) SubstringByTextElements(Int32, Int32) SubstringByTextElements(Int32, Int32) SubstringByTextElements(Int32, Int32)

Načte podřetězec textových prvků z aktuálního StringInfo objektu počínaje zadaným textovým prvkem a pokračuje v zadaném počtu textových prvků.Retrieves a substring of text elements from the current StringInfo object starting from a specified text element and continuing through the specified number of text elements.

ToString() ToString() ToString() ToString()

Vrací řetězec, který představuje aktuální objekt.Returns a string that represents the current object.

(Inherited from Object)

Platí pro

Viz také